Before the 3rd century you're having several philosophical schools still as a going concern. You have not only the Platonists and the Aristotelians but you have Scepticism, you have Stoicism, you even have a little bit of Epicureanism. And what happens after Plotinus is that everybody becomes a Neo-Platonist. So if we then go forward to the Islamic world for example, Plotinus is immensely influential, and Neo-Platonism becomes at least one major component of mainstream Islamic philosophy as well.
Peter AdamsonThere's a stronger and more kind of controversial element of Plotinus' view of matter, which is that he actually identifies it with evil, or at least the principle of evil, and the reason for this is that he thinks that the the One, the highest principle, can also be thought of as the Good, and that's kind of surprising like, because he has this negative theology which doesn't allow us to say anything about the One. But he believes that it can be seen as the principle of goodness as well as unity, and that if you think about it, goodness and unity sort of go along with each other.
Peter Adamson